Hi Jim, Ok I send you a PM. Note however that I need the 48 pin one. 40 pin one is good for 8501 replacement. Thanks Istvan On Sat, Jan 16, 2021 at 7:24 PM Jim Brain <brain_at_jbrain.com> wrote: > On 1/16/2021 4:15 AM, Istvan Hegedus wrote: > > >> >> I can't argue the smaller footprint FPGA and 4 layer PCB, but I'd keep >> the surface mount header. I think they look much more neat in circuit >> and if you trim the outside of your PCB to just beyond the SMT pins, I >> don't think the design will be too wide. Having the pins sticking >> through reduces top PCB area a lot and then you have to worry about >> cutting the pins off and making sure they do not touch metal shields and >> such if folks re-assemble the EMI stuff. >> >> Jim >> >> You are right, if I use through hole header then I don't have much space > left on the two sides for routing and components. > I will consider it. There are only 2 drawbacks, price of the smd IC header > and the lead time (I have ordered it at Mouser in november and they promise > it now at the end of feb). > > Regards > Istvan > > I plan to buy 1000 of the SMT ones (I have the 28 pins in SMT and through > hole and the 24 in through hole and plan to buy in SMT as well) and am > happy to set aside 100 or so for you if desired. You can directly email > me for pricing, but I can't believe 40 pins of smt header would be no more > than 1.25 USD, and probably $1.00 (from my supplier, SMT and though hole > differ in price by only a few pennies), which looks far cheaper than Mouser > options (not sure why Digikey and mouser are so expensive on IC headers). > Lead time is about 2-3 weeks. I can mail you a few 28 pin ones to check on > quality if desired. > > You can see what the through hole ones look like here: > > http://store.go4retro.com/ic-header/ > > And the SMT ones look the same on the bottom, but the upper post is bent > out 90 degrees like in your footprint. > > Don't worry if you're not interested. I plan to buy the 40 pin SMT ones > either way and use for other projects. Just let me know your thoughts. > > If others are looking for non trivial connectors, let me know. I regularly > source in bulk and if I can put it in the store or think up a use in a > product, happy to buy 1000 of them (1000 is typically the minimum order > quantity for manufacturers). > > > Jim > > > > -- > Jim Brainbrain_at_jbrain.com www.jbrain.com > >Received on 2021-01-17 13:00:02
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